User account disconnects from router and disables internet

Hello,

Puzzling problem, wondered if anyone could help.

I have a wireless router and am connecting 2 phones (wifi) and 1 PC (ethernet).

The PC is running Windows 8 and has two User Accounts (I'll call them "Business" and "Personal").

Since setting up the router, the phones have connected over wifi without problem. If I log onto the "Personal" user account on my PC, it connects over ethernet, and the phones still work with wifi.

However, if I log my PC onto my "Business" user account, the PC says it has connected to the Home Hub via the ethernet cable, but there is no internet connection. It also causes the internet connection on the phones to drop (sometimes the wifi goes down completely, sometimes it says it's connected to wifi, but there is no internet). I don't think it's an ethernet problem either, as I connected my PC wirelessly instead of with the cable, and the same thing happens.

The PC only ever does this on the "Business" user account, the "Personal" account works fine (I'm using that now). Looked everywhere to find a solution, I assume it's something in the settings, rather than a router issue. Can't find the answer anywhere.

Please can anyone help?

Thanks.

Is this a computer from your work, or personal computer? If for work. Are you required to sign in with a Domain login? Also what is the manufacturer & model of your router? Does it do this, when you connect the computer with an Ethernet cable, directly to the router?